학술논문
Different mechanism of two-proton emission from proton-rich nuclei 23Al and 22Mg
Document Type
article
Author
Y.G. Ma; D.Q. Fang; X.Y. Sun; P. Zhou; Y. Togano; N. Aoi; H. Baba; X.Z. Cai; X.G. Cao; J.G. Chen; Y. Fu; W. Guo; Y. Hara; T. Honda; Z.G. Hu; K. Ieki; Y. Ishibashi; Y. Ito; N. Iwasa; S. Kanno; T. Kawabata; H. Kimura; Y. Kondo; K. Kurita; M. Kurokawa; T. Moriguchi; H. Murakami; H. Ooishi; K. Okada; S. Ota; A. Ozawa; H. Sakurai; S. Shimoura; R. Shioda; E. Takeshita; S. Takeuchi; W.D. Tian; H.W. Wang; J.S. Wang; M. Wang; K. Yamada; Y. Yamada; Y. Yasuda; K. Yoneda; G.Q. Zhang; T. Motobayashi
Source
Physics Letters B, Vol 743, Iss , Pp 306-309 (2015)
Subject
Language
English
ISSN
0370-2693
Abstract
Two-proton relative momentum (qpp) and opening angle (θpp) distributions from the three-body decay of two excited proton-rich nuclei, namely Al23→p+p+Na21 and Mg22→p+p+Ne20, have been measured with the projectile fragment separator (RIPS) at the RIKEN RI Beam Factory. An evident peak at qpp∼20 MeV/c as well as a peak in θpp around 30° are seen in the two-proton break-up channel from a highly-excited 22Mg. In contrast, such peaks are absent for the 23Al case. It is concluded that the two-proton emission mechanism of excited 22Mg is quite different from the 23Al case, with the former having a favorable diproton emission component at a highly excited state and the latter dominated by the sequential decay process.